Sound-deadener for rotary blowers.



-J. J. GIBSON E C. L. W. TRINKS. SOUND DBADBNER PORROTARY BLOWERS. APPLICATION IILBD SBPT.V24, 1909.

976,068. rammed Nov'. 15, 1910.

MZZ/zesses;

charge snperposed by a sound wave.

AUNITED STATES rPAIENT OFFCE.

JAMES JOSEPH GIBSON, OF HOMESTEAD, AND CHARLES L. W. TRINKS, OF ITTSBURG, PENNSYLVANIA; SAID TRINKS ASSIGNOR TO SAID GIBSON.

SOUND-DEADENER FOR ROTARY BLOVERS.

Specification of '.lietters Patent.

Patented Nov. 15, 1910.

Application filed September 24, 1909. Sera] No. 519.327.

T 0 all whom it 'muy concern.

Be it known that. we, .la uns Jesiden (ln:- soN, a resident of llomestead, Allegheny county, Pennsylvania, and Cinemas L. ll'. Tnnvks, a resident of Pittsburg, Allegheny county, Pennsylvania, have invented certain new and useful Improvements in Sound- Deadeners for Rotary Blowers, &e., ot' which the following isa specification. l

High speed compressors, and particularly high speed rotary blowers, are very noisy, first, because the rapid alternations ot' suction andeonipression transmit vibrations thxtough the metal which appear to the human ear as noise', second, because the discharge from any rotary blower ot' the displacement, type is discontinuous` and this` discontinuity is equivalent to a constant disrThis noise has been the principal reason for limiting the speed of Stich blowers, and attempts to overcome. ithave resulted in ine asino tite cost and weight of such machines.

For portable blowers light weight is ol: extreme importance, and tor-purposes ot vaeuum (flaming in residences. hotels, ete., absence ot' noise is of lstill greater importance.

The object olour invention is to intercept and deaden sound waves resulting `t'rom theI vibrations referred to. which, in the pres-4 ent. embodiment, we accomplish by inclosiniithe noisy part of the machine in a practically sound-proof jacket of improved construction, the space between the jacket walls being filled with a light. gas, preferably hydrogen gas below atmospheric pressure, the space being' of eourse hermetically sealedm lt is known that for the, transmission ot sound a 'medium is required, also that perfeet. 'annum absolutely prevents transmission of sound. For a portable machine a jacket inclosing,r a vaeumn would be prohibitive on account. of the means necessary to prevent the jacket from colla psi ug under the pressure ot' the atmosphere. l'f stays were used between the ialls ot' the jaeket, vibrations and consequently sound would be transmittetfl. VIt the walls were niade heavy enough` to) withstand atmospherie pressure, withoutI stays, the weight ot` the jacket would be excessive.. Next to perfect vacuum an extremely light gas is the best sound dead ener. lure hydrogenv extremely light and hence admirably suited for the purpose if inelosed hernictically between the walls.. 'l`he .sound deadenine properties of the jacket increase with the rareticatiou ol" the gas, and hence we preferably reduce the pressure thereof below atmosphere pressure.

'.l`wo enihoi'liments of the invention are illustrated by Figures l and i! ol the aecompanyingr drawings, the .sound d widening jaeket shown in .section in cach instance.

The formation of an air tight jacket requires the use ot two shells suitably eenneeted. ln the embodiment' of Fig. l the jacketl which incloses the operating or noisy part Q ot the blower, compressor. or like machine. consists ol :in ontei- `shell Il and an inner shell l, the shells beineY .spaced apart as required to contain a suitable ainount'of Y hyulrogen or etpiivalen't. iras. 'lhe shells may be secured together and to the machine by so engaging' the extremity ot inner shell L as to canse it to tit the extrcnutv ot shell 3,

ras indicated at 5. with the parts brazed or welded to Vt'orin an air tight joint. ,ln internally threaded ring t3 may be .secured within the united ends` of the .shells tor removably seturiiner the jacket to threaded portion 7 of the machine. thereby l'ully inclosing part 2 o't the latter.

l'n tl adaptation of Fig: 2, an entire niachine S is inclosed by the jacket'. the main portion ot the latter consisting' ol the outer and inner shells E) and l0. respectively, which have the lap-joints ll with the jacket entlportion .12 ot' like twoshell Formation, in the present instance this end portion having a passage ior power .shatt lil extendingY to macl-ine 8.

From the t'oiegoiir'er it willlbe understood that the invention may be applied in various ways, the illustrations herein beine' only two of numerous available embodiments.

The invention is not rest rieted to the use of hydrogen', as any other las may he used havingr like physical property ot Vextremely si all mass per unit volume under given conditions olf pressure and temperature.

lVe claim:

l. ln a sound deadener, a hollow-wall jacket inelosino the sound producer` and hydrogen las tilting,A the space between the jacket; walls.

2.111 a sound deadener, a jacket consisting In testimony whereof we ax our sgnaof thejhner and outer wallsspacedapart and l tures in presence of two witnesses. Y extending around the sound producer, supe JAMES JOSEPH GIBSON. porting means common to the walls with CHARLES L. W. yTR'NKS. 5 the fatter connected together only at the Witnesses:

supportinemeans, and hydrogen gas filling Il F. E. GAITHER,

the space tween said walls. J. M. NESBIT. 

